1. The Cartilage and Connective Tissue Research Laboratories, Mayo Clinic, Mayo Foundation, Rochester, Minnesota, and St. Michael's Hospital, University of Toronto, Toronto, Canada
2. The Cartilage and Connective Tissue Research Laboratories, Mayo Clinic, Mayo Foundation, Rochester, Minnesota, and St. Michael's Hospital, University of Toronto, Toronto, Canada
3. The Cartilage and Connective Tissue Research Laboratories, Mayo Clinic, Mayo Foundation, Rochester, Minnesota, and St. Michael's Hospital, University of Toronto, Toronto, Canada
4. The Cartilage and Connective Tissue Research Laboratories, Mayo Clinic, Mayo Foundation, Rochester, Minnesota, and St. Michael's Hospital, University of Toronto, Toronto, Canada